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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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E2 Reaction: Kinetics and Mechanism02:45

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X-ray Diffraction of Biological Samples01:10

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Hyperpolarized Xenon for NMR and MRI Applications
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Published on: September 6, 2012

Dynamic Xe Recognition-Resonance-Capture Mechanism in Tröger's Base Dihedral Angle for Efficient Xe/Kr Separation.

Yinhui Li1, Youzhi Wang1, Yongzheng Wang1

  • 1State Key Laboratory of Fluorine & Nitrogen Chemicals, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, P. R. China.

JACS Au
|May 29, 2026
PubMed
Summary

Researchers developed flexible porous adsorbents (TBPOFs) that dynamically capture Xenon (Xe) over Krypton (Kr) using a novel mechanism. These materials achieve record selectivity and enable efficient, one-step Xe purification for energy savings.

Keywords:
Tröger’s BaseXe/Kr separationporous organic polymersrecognitionresonance

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Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
11:53

Purification and Reconstitution of TRPV1 for Spectroscopic Analysis

Published on: July 3, 2018

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Separating Xenon (Xe) from Krypton (Kr) is crucial but challenging with existing rigid porous adsorbents due to Krypton (Kr) coadsorption.
  • Developing adsorbents with dynamic selectivity is key for efficient Xe/Kr separation.

Purpose of the Study:

  • To design novel flexible porous adsorbents based on Tröger's Base dihedral angle structures (TBPOFs) for selective Xe/Kr separation.
  • To investigate the Xe "recognition-resonance-capture" mechanism in these dynamic adsorbents.
  • To achieve high Xe uptake capacity and selectivity, enabling efficient Xe purification.

Main Methods:

  • Synthesis of flexible porous adsorbents (TBPOF-1 to TBPOF-4) utilizing Tröger's Base dihedral angle structures.
  • Gas adsorption isotherms and kinetic studies to evaluate Xe and Kr uptake.
  • IAST selectivity calculations and breakthrough experiments for mixed-gas separation.
  • Density Functional Theory (DFT) and Molecular Dynamics (MD) simulations to elucidate the capture mechanism.

Main Results:

  • TBPOFs exhibit dynamic flexibility, enabling selective Xe capture over Kr via a "recognition-resonance-capture" mechanism.
  • Record IAST Xe/Kr selectivity of 483.8 achieved at low pressure (0.01 bar).
  • Exceptional Xe adsorption capacity with negligible Kr uptake below 0.2 bar.
  • Rapid Xe adsorption kinetics (10.4 mL g-1 s-1) and high kinetic selectivity (1166).
  • Successful one-step Xe purification (>99.9% Xe) demonstrated in breakthrough experiments, even with trace concentrations.

Conclusions:

  • The developed flexible TBPOFs offer a transformative strategy for energy-efficient Xe/Kr separation.
  • The dynamic "recognition-resonance-capture" mechanism is effective for selective Xe adsorption.
  • These materials pave the way for advanced adsorbent design in gas separation applications.